<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Document</title>
    <style>
      table {
        width: 500px;
        margin: 100px auto;
        border-collapse: collapse;
        text-align: center;
      }

      td,
      th {
        border: 1px solid #333;
      }

      thead tr {
        height: 40px;
        background-color: #ccc;
      }
    </style>
  </head>

  <body>
    <table cellspacing="0">
      <thead>
        <tr>
          <th>姓名</th>
          <th>科目</th>
          <th>成绩</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody></tbody>
    </table>
    <script>
      // 1.先去准备好学生的数据
      var datas = [
        {
          name: '魏璎珞',
          subject: 'JavaScript',
          score: 100
        },
        {
          name: '弘历',
          subject: 'JavaScript',
          score: 98
        },
        {
          name: '傅恒',
          subject: 'JavaScript',
          score: 99
        },
        {
          name: '明玉',
          subject: 'JavaScript',
          score: 88
        },
        {
          name: '大猪蹄子',
          subject: 'JavaScript',
          score: 0
        }
      ];
      //1. 获取事件源
      var tbody = document.querySelector('tbody');
      //循环获取数组的长度
      for (var i = 0; i < datas.length; i++) {
        //创建tr
        var tr = document.createElement('tr');
        var item = datas[i];
        for (var k in item) {
          var td = document.createElement('td');
          td.innerHTML = item[k];
          tr.appendChild(td);
        }
        tbody.appendChild(tr);
      }
    </script>
  </body>
</html>
